well, the problem is not the mail but when you cut the statement. If today, for instance, you process 50MM statements in 24 business days, in the future you will have to process the same amount in 20 business days. If your billing process takes 10 hrs as it is, then it will be strained even more in the future. that is why February is usually a tough month to run your billin cycles, because the # of business days is smaller